Process for the preparation of solid photoactivator...

Details Process for the preparation of solid photoactivator... Process for the preparation of solid photoactivator...

C - Chemistry, Metallurgy

11

D

31/104, 134/5

C11D 3/395 (2006.01) C09B 67/54 (2006.01) C11D 3/00 (2006.01) D06L 3/12 (2006.01)

Patent

CA 1217333

Process for the preparation of solid photoactivator formulations Abstract of the Disclosure The invention relates to a process for the preparation of solid photoactivator formulations containing sulfonated zinc or aluminium phthalocyanines. The process comprises passing a crude solution containing these compounds through a semipermeable asymmetrical membrane having a pore diameter of 1 to 500 .ANG. and drying the photoactivator solution obtained under mild conditions. The membrane consists of a basic structure of cellulose acetate, polyacrylo- nitrile or a copolymer of acrylonitrile and other ethylenically unsaturated monomers. This basic structure is modified in specific manner with ionic groups. If desired, fillers and/or surfactants customarily employed in the detergent industry may be added to the concentrated solution before it is dried. The solid photoactivator formulations so obtained have excellent storage stability, are substantially non-hygroscopic, and contain exceedingly small amounts of undesirable organic impurities.

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